STARFISH SAPONINS .3. NOVEL STEROIDAL SAPOGENIN, 17-BETA-METHYL-3-BETA,6-ALPHA-DIHYDROXY-18-NOR-5-ALPHA-CHOLESTA-9(11),13-DIEN-23-ONE, FROM THE STARFISH ASTROPECTEN-AURANTIACUS
TETRAHEDRON LETTERS（1979）
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